src/share/classes/sun/text/resources/ja/FormatData_ja.java

*** 89,99 ****
              "\u897f\u66a6", // Seireki (Gregorian)
              "\u660e\u6cbb", // Meiji
              "\u5927\u6b63", // Taisho
              "\u662d\u548c", // Showa
              "\u5e73\u6210", // Heisei
!             "\u5143\u53f7", // NewEra
          };
          final String[] rocEras = {
              "\u6c11\u56fd\u524d",
              "\u6c11\u56fd",
          };
--- 89,99 ----
              "\u897f\u66a6", // Seireki (Gregorian)
              "\u660e\u6cbb", // Meiji
              "\u5927\u6b63", // Taisho
              "\u662d\u548c", // Showa
              "\u5e73\u6210", // Heisei
!             "\u4ee4\u548c", // Reiwa
          };
          final String[] rocEras = {
              "\u6c11\u56fd\u524d",
              "\u6c11\u56fd",
          };